/usr/include/qpid/client/FailoverManager.h is in libqpidclient2-dev 0.16-7ubuntu5.
This file is owned by root:root, with mode 0o644.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 | #ifndef QPID_CLIENT_FAILOVERMANAGER_H
#define QPID_CLIENT_FAILOVERMANAGER_H
/*
*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*
*/
#include "qpid/Exception.h"
#include "qpid/client/AsyncSession.h"
#include "qpid/client/ClientImportExport.h"
#include "qpid/client/Connection.h"
#include "qpid/client/ConnectionSettings.h"
#include "qpid/client/FailoverListener.h"
#include "qpid/sys/Monitor.h"
#include <vector>
namespace qpid {
namespace client {
struct CannotConnectException : qpid::Exception
{
CannotConnectException(const std::string& m) : qpid::Exception(m) {}
};
/**
* Utility to manage failover.
*/
class QPID_CLIENT_CLASS_EXTERN FailoverManager
{
public:
/**
* Interface to implement for doing work that can be resumed on
* failover
*/
struct Command
{
/**
* This method will be called with isRetry=false when the
* command is first executed. The session to use for the work
* will be passed to the implementing class. If the connection
* fails while the execute call is in progress, the
* FailoverManager controlling the execution will re-establish
* a connection, open a new session and call back to the
* Command implementations execute method with the new session
* and isRetry=true.
*/
virtual void execute(AsyncSession& session, bool isRetry) = 0;
virtual ~Command() {}
};
struct ReconnectionStrategy
{
/**
* This method is called by the FailoverManager prior to
* establishing a connection (or re-connection) and can be
* used if the application wishes to edit or re-order the list
* which will default to the list of known brokers for the
* last connection.
*/
virtual void editUrlList(std::vector<Url>& urls) = 0;
virtual ~ReconnectionStrategy() {}
};
/**
* Create a manager to control failover for a logical connection.
*
* @param settings the initial connection settings
* @param strategy optional stratgey callback allowing application
* to edit or reorder the list of urls to which reconnection is
* attempted
*/
QPID_CLIENT_EXTERN FailoverManager(const ConnectionSettings& settings, ReconnectionStrategy* strategy = 0);
/**
* Return the current connection if open or attept to reconnect to
* the specified list of urls. If no list is specified the list of
* known brokers from the last connection will be used. If no list
* is specified and this is the first connect attempt, the host
* and port from the initial settings will be used.
*
* If the full list is tried and all attempts fail,
* CannotConnectException is thrown.
*/
QPID_CLIENT_EXTERN Connection& connect(std::vector<Url> brokers = std::vector<Url>());
/**
* Return the current connection whether open or not
*/
QPID_CLIENT_EXTERN Connection& getConnection();
/**
* Close the current connection
*/
QPID_CLIENT_EXTERN void close();
/**
* Reliably execute the specified command. This involves creating
* a session on which to carry out the work of the command,
* handling failover occuring while exeuting that command and
* re-starting the work.
*
* Multiple concurrent threads can call execute with different
* commands; each thread will be allocated its own
* session. FailoverManager will coordinate the different threads
* on failover to ensure they continue to use the same logical
* connection.
*/
QPID_CLIENT_EXTERN void execute(Command&);
private:
enum State {IDLE, CONNECTING, CANT_CONNECT};
qpid::sys::Monitor lock;
Connection connection;
std::auto_ptr<FailoverListener> failoverListener;
ConnectionSettings settings;
ReconnectionStrategy* strategy;
State state;
void attempt(Connection&, ConnectionSettings settings, std::vector<Url> urls);
void attempt(Connection&, ConnectionSettings settings);
};
}} // namespace qpid::client
#endif /*!QPID_CLIENT_FAILOVERMANAGER_H*/
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